| MEASUREMENT PROPERTIES | |
| Limitations | <5 European languages (English) |
| Observations |
There is a short version of the VLA, the S-VLA. The S-VLA includes 14 activities related to obligatory, committed, or discretionary activities and has good psychometric properties |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
The S-VLA is reliable according to expected a posteriori prediction reliability (0.949) and has an excellent internal consistency (Cronbach’s α = 0.97) |
| B. Reliability intraobserver or test-retest | Not Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
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| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
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| 2. VALIDITY | |
| A. Content validity: face validity | Not Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
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| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Tested |
| Brief Description |
The S-VLA demonstrated excellent construct validity. Significant correlations with all other measures in hypothesized directions were found. The S-VLA accurately represents results obtained with the longer version of the VLA scale. All of the items were strongly correlated with the S-VLA total score. |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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